string mycombox = comboBox3.Text.Trim();
            if (comboBox3.SelectedItem.ToString() == mycombox )
            {
                OleDbConnection thisconn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + System.Windows.Forms.Application.StartupPath + "/CnEduCode.mdb");
                OleDbCommand mycomm = new OleDbCommand();
                mycomm.Connection = thisconn;//初始化connection


                = "select Cn_SoftID from Cn_CustomEdit where Cn_CusName ='" + mycombox + "'";


                thisconn.Open();//打开连接


                OleDbDataReader thisread = mycomm.ExecuteReader();
                while (thisread.Read())
                {
                    string mycoid = Convert.ToString(thisread["Cn_SoftID"]);
                    cn_SoftIDTextBox.Text = mycoid;
                    thisread.Close();
                    return;
                }
            }


textbox和combobox内容都在数据库同一表中。当选中combobox的一个数据后，textbox显示与combobox内容相符的数据，如何做呀，上面错误在哪？
谢谢！

if (comboBox3.SelectedItem.Value== mycombox )

this .comboBox3 .Text就可以了

[[it] 本帖最后由 brightmoon 于 2008-12-14 22:16 编辑 [/it]]